我国有色金属铜、铅冶炼企业，在铜、铅熔炼中每年使用金块矿数万吨。这些矿石含金1g／t到几十克／吨不等，有的甚至高达几百克／吨。然而金块矿中含金几乎为自然金，其化学成份变化范围相当大。检验时，个体和总体只能在某种范围内和在一定程度上达到基本相同，分析结果的再现 China’s non-ferrous metal copper and lead smelting enterprises use tens of thousands of tons of gold ore in copper and lead smelting each year. These ores contain gold ranging from 1g/t to several tens of grams/ton, some even as high as several hundred grams/ton. However, the gold in gold nuggets is almost natural gold, and its chemical composition varies considerably. When testing, the individual and the population can only reach the same level within a certain range and to some extent, and the analysis result can be reproduced